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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f2389262c902a412b3d09a7dfd9391d999d5c86ec1e83ca2336948a005914d' 
  AND token = 's0wEVqtuiS4QTRn6B6IRF/vL7vJJZhIcie3Ljv7fRXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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