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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb422331a1ec924f23c5d9260f8689f12c3a2b15c8fac78b1fbb2a850e1c3b27' 
  AND token = 'AoNzvZbanNv7TS5yMT5PlFfUMADqc+B18VV5XmMlphw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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