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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f83dc92b286ae2468a412e109937f3bc4b1287d55e8f73b8315cdccd063170' 
  AND token = 'uDcp9ksZ29miim4TLW/7RQP+Da0inribNtSb+f1rNv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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