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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8431976c6cd9833508fcf3916d6ba39355626808eb51d9714f3455430021d68a' 
  AND token = 'f0+dyfy2v8ksPq/6D25Cru1vtwhm912C13jx4o90sXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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