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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c18da51c1cf1d4ddad2401e7302a2f6469834e4cbac1f10b591d4e941b6c3a9' 
  AND token = 'fMbwlKUObAcENSJo+d9MAQ3wD9t8xuCvc5CpaSOxIDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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