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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987c3823f4d4b8cd2665afac6a8079e3c7dfcf1959bbb805495145da1f883e6d' 
  AND token = '0/c3css0u6IVaSjIsO3GszIICGhM51MBvdYV8irOW7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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