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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51cf6545fdb00a3e61dea165e0306288436cbd2f92657322a9e5c417141947b4' 
  AND token = 'SOj85QTxyD0G1XZ4PFGC/O0lRpkcs0n9GquKXA4OXzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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