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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76637f0b62c4faf033f4bcab1354ee3d79af25fd8a12c6790bf1fc8fa7b4e7df' 
  AND token = 'teEXzwkY+a4xbY6zGVQNBb4N1eeq3oCZrboz93H65cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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