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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd09e229b1e3627d1ae0e05f794569ec33e10d687e8c9deec43bfacf51f0bb9' 
  AND token = 'WoygoZSaYSoFIksCeuDNTWNR18Np3YPOFzwhECluyYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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