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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854f8ed85f8679a3b8dc5ffd1adc26e4889aa58a885a2dd91ac490c3229d1f1c' 
  AND token = 'xKQVAuJIOQct19ACF6blhPPddZt7Qiv6uaudzlNGRME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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