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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d6a1db6bb8274b556b69339553ed321a600fc6d3f4f22d0b160068269826e9' 
  AND token = 'nFJtlh8JV7sAobvUH9MimTWRL4LkfoSJYzE7isF1nPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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