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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdfd2bfd557eacb8c497e67cefcd0f198addeb3f1b4b87fb6c2078bc2bf4e458' 
  AND token = '0ss5em15GlC08bcF2ahEAn/ESh3R+w5h1Jh/w2A3yFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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