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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e7ac0b829167d2d2a7fd315cb1a7e6fe67dad261fe3c6df61b43affdca7fb0' 
  AND token = '88qEmYPf7t7DTHbGzSiMMutQ/MMnzF6nFzkRAXn6kMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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