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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b474321b63ed396fd50b2a7fdd699c9e323369a64225ef45366e2244bf97f1' 
  AND token = '2QqS01tJiyBG1WcMy2Q0FFAzHfVmbctX7K7g+aJaEAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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