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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb393e881614b0950f42c643c8b8f8ee929b0a9d716f9283a652eea6b5c7aa02' 
  AND token = 'WNA9XCvAbKYbTt099uzApjc6Vyob6sq71y3FjGYnJvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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