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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f0a6cbf23a4f94ec317e333c150bf5a7abad7577065e5499efb8f33be9fc51' 
  AND token = 'FqUVTtmPqeK/9JrdfcVAssb5l3fDBRPlagI2xjAip3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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