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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770258dd96f5dd7dbf5a2ff2221a45321da6f66ed2580748ec831f0318deb008' 
  AND token = 'ycsge5JCap8G16Z7qX6stR8GPMGl2ZfVFmidBfM+Ojk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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