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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2e11e662821e022fa4e6fef7b33a084f35eaf0a626013a7c799c6b9d61742e' 
  AND token = 'h4RrcLaGcQufBOIfeUpY+TXEOUc9rZOjq60mFyqcNIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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