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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e2a188495c1d406b9d0197b92ecc848305540afd078571dec14936fcb4dcb1' 
  AND token = 'KcSKdMivKEuxcZpkM8l9m2F4dZP+rcNMb6ImF6Y+4I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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