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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc84bc4fe5412f21b93bb5711a8adb80a988f3d785c37e245d5bf644a5e7eb40' 
  AND token = 'SiY4RWBFui7SwZlfpHpnwKXC425ggXNfxabalA7MXFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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