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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec23ab23aecffab3f16562cb3219e719510c37ed9a16f545ae86b626e16b8f69' 
  AND token = 'I3vYo0IihEPePkFVw9rD3QIj+HDZFexzJA8xK5kCP9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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