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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea78235fc90738adf8414bef34735f7d218917fbe6df50ba9e5642f499d71ec' 
  AND token = 'hhdYsfQPC8ZWAYkjib+GPo6Y7iNsJ6gdV3Dumr9sYcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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