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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec7cb959ad66685ac16dcd5c65636365acb838e19816043f2e6433b62a6901c' 
  AND token = '2webYYT7o9x8h3rAGK6LZQ3OPRMjyB4JM0joKAPXcwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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