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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '187076c43aff0f77889a9b50089cf66e8dc1049b20ed354d1c82b230180c05e0' 
  AND token = 'c2vGEEP2rmHj0EAPNZbuotR/ZHt2XoIZZehWvCYU1W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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