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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9d366cb2e20c10982dc6abd3d1893e93185aeafea9d95d3be65822c60f1e90' 
  AND token = 'F4CYRuaCX5vNID6FHKib1Sa0WrvSseBv/njnSRplsDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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