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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec48dc9cd0fa41a8fc746f069b6f76f2d758ef29bb7222e27cc2f9f2c3d93537' 
  AND token = 'jV3qqL3tQ+KqCUVq1A8L8DFUD1pf5XYpqxW/Ik6Z8t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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