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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec2df90aa129626e814f17d97f9fd740ced667e05a5d3ec3fb8ad562b2b179a9' 
  AND token = '6mn92ilsdlint4XwikUQx7QR9hKNX727cfnDuS1hh+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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