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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fb3f90abb47b66d27d6b41b292cee605b4ce032aee6cdf1d5a922bf96621a0' 
  AND token = '3VS2Az0glb4QFdFYvUpFYqIf1hIU3Bc5wVtQVTSD80E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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