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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bc0aee00c9b4e49e0e152e1bfe131c839f770425aabdffaac56ea670d0c5dc' 
  AND token = 'U/A+x1oSJL9UXgps9IDNK3cvjHCciBsNrPhg+0WLMa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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