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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97899788ace1ca9d8f941ff708c90c00115df3f28727ce47387390dcca8762d4' 
  AND token = 'RfHAPDwPc8fEnEVj67uImr9mkP/prz0fsNwBBQyP3Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}