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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8851578c228705413c5318b0336e4d142e2cc9eae4e346528c73e7b5c0a0c32f' 
  AND token = 'FlLFkwWw+HXp8/PRctRhcrteHrm0Mhnqer904EoQ7XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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