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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b919c6e190215c720c4d97c700107a9115ac2f96a0e208a7b2c4e29db957b056' 
  AND token = '7kAwbs+6BzZzU1kE32/UfPxhyspB1KPkbXxN0jHzW04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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