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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e51068ee44297d402101c3c359cf1c891198ac426c679e41e6f11a0743d439' 
  AND token = 'rmhbJ7HrqoMtCGPNvZWo1OLUI2rITo0UrgzioEOY7QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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