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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fcf8a51d5b3d5c296e0acb602bf0a0c4dac6f2e3cb68d2f7967e3e31a05752e' 
  AND token = 'FClW6sVaIHY+frJZ91VD0tiqxH3sfxfZqAg8y5cPr6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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