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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14edf3877d8455d2274b72cc58041c2caeb9b718976fbb8caf18864384ce6016' 
  AND token = 'RcG4OY7+/++u00icoNX8emiCBI9+JcWN5SkVo0ggDn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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