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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e6f3fc0b13ac3739887943c276f723738bc9a380e6b03f8119a2b931e136902' 
  AND token = 'Egm8DCh4JHqRy4gtc9BpfY+lpUQSdTIc4fFs3/93hsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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