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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba31b22c6dec509e50995cee03debbba521e0388667211253669534fb3d004c1' 
  AND token = 'Epj6SAgY3eo+ae/xP+iFkzcSMtu5VD+hH/n7cC0v6cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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