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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6ebd286f04c7cc6b20cd0305fddcaf819303421ee6df888e9386d565fcda0b' 
  AND token = '+9jVMqCM2rbfem43Ah45MLmVQ+/EhLb3CzizK1ncAec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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