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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed0b4b59afafe3f5fd0574f840446dec51f1c8a64bb9df9de822bf2ad5e8800c' 
  AND token = '0q6tTCJ9R+9P7mC132Fk5HHGDXet/SZKeV8dbOK4ikM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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