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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113a1ac5c08006d342a388256e468b69281c78b97456fe4f373bca2fe6979035' 
  AND token = 'iLR6j+NUvh54A94vz7HUViMzyXZvnD5fderex3kVf00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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