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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2ebbe283d3393a67b6cb746d399eeddfc35caa3eee2a3b32c8e75faa2cfdc1' 
  AND token = '0z4MlrFNxh0GVE4smmcKMAaiHFWbVi8BOUfCWIi1qQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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