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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15f237f2d287db5e9910c0d62774e9598ac080136f90ac7dbe9296d7300d3ac' 
  AND token = 'UnFfFhxS6n9sU/EdIBdeaVswxNlm1j5KsUpdcYEIxsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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