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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db103cf2059943096ec3dff337327aa0675c476bdf40eec3ece47664fd095e21' 
  AND token = '/ece2hS8lAWkGtDmUeUL4osdyOZkDPeX20jTL3zIBUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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