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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f642e4fc74aca16c8f186c6954d56ccb938ec71ae165273e37e55f2c5e77867' 
  AND token = 'IERaASIjO2nmcqXMfCr6t4ty0QUmcJgZPgJAa8oO8xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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