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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b45a50ac7aecd00c777ce344f0b0ad9af8b2d93c9e82a2cd93d09db33c91aa5' 
  AND token = '0a4DFNCmUN9gs/2xpCWQRz29m7UYlggnBLuWG7ItwBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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