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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c4447f98eca534d25dfe6d5adcfc0f9271724cf6b2dedc5f62d716eb11b0b7' 
  AND token = 'WyGn7x1x796VeABTkIaCg+8sv4ByzwNpg1vtknEEgc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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