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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6e86b2b6805a071a11b061de625ad82a2bc9044b433533726167c9aa2d8f98' 
  AND token = 'lhWvKA1rFVVfmcvJLIG1WaG71io8oDzSqZ0olGdoOT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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