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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a89e9acb14dd21b777edc401101ae0657b0b6144387e14d0061b4f188b0dea2' 
  AND token = 'UcaA8zFsf7ub6dDAw0LD+C2xzGPDqqgeh0j8vYtvOmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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