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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b418bc1e05653c1283e0ead54c470f76dd2ea02fc4e6325a51297d95c111692e' 
  AND token = '3+Nze00Edm3clMv2QNMgrV7lHvkKbWk/Fr3dCw9O2/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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