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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8fb1f7b0445deefb1af944a1fec3894c62830f94dcb03c1e9a44c22a31f383' 
  AND token = 'nVGn0OwwgFv7nmuu3O7zSo8ywuqig0NQN5Z32cwHwks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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