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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e62cbaf586ab46b3b2eb2ff067d28fabb896aeb9d76c5ebfffa1a5761e2660' 
  AND token = 'XVgRR1VBfxFiS+DH/Vrh+XQEmqfylNedCS//rPwWBNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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