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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c8627cc2e3130a6cc7c36acc22b321836186850547538ea63846cef592d5df' 
  AND token = 'Vd4Y+yGSHou45V473TG5IkukInXYY9wGcK4K54+qPUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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